This observational study aims to investigate the internal responsiveness and external responsiveness of the Bridge Tests (supine bridge test, prone bridge test, and side bridge test) in relation to pain and disability, in subjects with subacute and chronic non-specific low back pain submitted to a physical therapy program.
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Changes in low back pain over time
Timeframe: Time zero: at baseline - Time one: at the end of the last session of physical therapy treatment (8 weeks after Time zero)
Changes in lumbar disability over time
Timeframe: Time zero: at baseline - Time one: at the end of the last session of physical therapy treatment (8 weeks after Time zero)